Chevrolet Trax: DTC B0014, B0021, B0031, OR B0038: Seat side air bag deployment loop
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptors
DTC B0014 01
Driver Seat Side Air Bag Deployment Loop Short to Battery
DTC B0014 02
Driver Seat Side Air Bag Deployment Loop Short to Ground
DTC B0014 04
Driver Seat Side Air Bag Deployment Loop Open
DTC B0014 0D
Driver Seat Side Air Bag Deployment Loop High Resistance
DTC B0014 0E
Driver Seat Side Air Bag Deployment Loop Low Resistance
DTC B0021 01
Passenger Seat Side Air Bag Deployment Loop Short to Battery
DTC B0021 02
Passenger Seat Side Air Bag Deployment Loop Short to Ground
DTC B0021 04
Passenger Seat Side Air Bag Deployment Loop Open
DTC B0021 0D
Passenger Seat Side Air Bag Deployment Loop High Resistance
DTC B0021 0E
Passenger Seat Side Air Bag Deployment Loop Low Resistance
DTC B0031 01
Left Rear Seat Side Air Bag Deployment Loop Short to Battery
DTC B0031 02
Left Rear Seat Side Air Bag Deployment Loop Short to Ground
DTC B0031 04
Left Rear Seat Side Air Bag Deployment Loop Open
DTC B0031 0D
Left Rear Seat Side Air Bag Deployment Loop High Resistance
DTC B0031 0E
Left Rear Seat Side Air Bag Deployment Loop Low Resistance
DTC B0038 01
Right Rear Seat Side Air Bag Deployment Loop Short to Battery
DTC B0038 02
Right Rear Seat Side Air Bag Deployment Loop Short to Ground
DTC B0038 04
Right Rear Seat Side Air Bag Deployment Loop Open
DTC B0038 0D
Right Rear Seat Side Air Bag Deployment Loop High Resistance
DTC B0038 0E
Right Rear Seat Side Air Bag Deployment Loop Low Resistance
Diagnostic Fault Information
Circuit/System Description
During a side or frontal crash of sufficient force, the inflatable restraint
sensing and diagnostic module (SDM)
will allow current to flow through the deployment loop in order to deploy an air
bag. There are 2 shorting bars
used within the connector that will short the control circuits together when the
connector is disconnected. This
will help to prevent unwanted deployment of the air bag or retractor
pretensioner during servicing.
Conditions for Running the DTC
Ignition voltage is between 9-16 V.
Conditions for Setting the DTC
B0014 01, B0021 01, B0031 01, B0038 01
The air bag control circuit is shorted to voltage for 2 seconds.
B0014 02, B0021 02, B0031 02, B0038 02
The air bag control circuit is shorted to ground for 2 seconds.
B0014 04, B0021 04, B0031 04, B0038 04
The air bag control circuit is open for 2 seconds.
B0014 0D, B0021 0D, B0031 0D, B0038 0D
The air bag deployment loop resistance is greater than 4.2 ohms for 2 seconds.
B0014 0E, B0021 0E, B0031 0E, B0038 0E
The air bag deployment loop resistance is less than 1.4 ohms for 2 seconds.
Action Taken When the DTC Sets
- The inflatable restraint sensing and diagnostic module requests the
instrument cluster to illuminate the
AIR BAG indicator.
- The inflatable restraint sensing and diagnostic module will store a DTC,
however if an event occurs the
system will still attempt deployments.
Conditions for Clearing the DTC
- The condition for setting the DTC no longer exists.
- A history DTC will clear once 100 malfunction-free ignition cycles have
occurred.
Diagnostic Aid
NOTE: The following diagnostic aids apply for both current and
history DTCs.
An incorrectly installed connector position assurance (CPA) or incorrectly
seated connector can cause a
shorting bar to short both control circuits together. Check the connectors and
CPAs if a DTC with symptom
byte 02 or 0E is set, to ensure the shorting bars are not causing the circuits
to be shorted together. Shorting bars
are used in the locations listed below:
- Front and rear seat side air bags
- Left and right roof rail air bags
- Inline harness connectors
- Harness side of the inflatable restraint sensing and diagnostic module
connector
Terminal fretting or incorrectly seated connector can cause an open/high
resistance condition. Check the circuit
terminals for fretting or incorrectly seated connector if a DTC with symptom
byte 04 or 0D is set. DTCs of
deployment loops which are in the seat can occur because of stress or damage to
the harness due to seat
movement. Move the seat to the full extent of travel while using the scan tool
to observe deployment type loop
parameters.
Reference Information
Schematic Reference
SIR Schematics (Encore), SIR Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
Description and Operation
Supplemental Inflatable Restraint System Description and Operation
Electrical Information Reference
- Circuit Testing
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
- Connector Repairs
Scan Tool Reference
Control Module References for scan tool information
Special Tools
EL-38125-580 Terminal Release Tool Kit
Circuit/System Verification
NOTE:
- Refer to SIR Service Precautions.
- Inspect all terminals for damage or corrosion when disconnecting
connectors. Damage or corrosion in the following requires repair or
replacement of the affected component/connector.
- Seat side air bag
- Inflatable restraint sensing and diagnostic module
- All wiring harness connectors
- Inflatable restraint sensing and diagnostic module wiring harness
connecto
- The connector and connector position assurance (CPA) may seat
independent of each other. Both the connector and CPA should seat with
an audible and/or tactile click. The CPA isolates the shorting-bars within
the connector allowing the deployment circuit to operate properly.
- If the condition is intermittent or cannot be duplicated, disconnect
the
connectors and add dielectric grease/lubricant (Nyogel 760G or
equivalent, meeting GM specification 9986087). This procedure will correct
the high resistance condition due to terminal fretting corrosion.
- Verify the appropriate scan tool Deployment Loop Resistance parameters
stay consistently between 2.1-
4.0 ohms without any spikes or dropouts while moving the harness near each
connector.
- F106 Seat Side Air Bag
- Any inline harness connector
- K36 Inflatable Restraint Sensing and Diagnostic Module
- If less than 2.1 ohms or greater than 4.0 ohms
Refer to Circuit/System Testing.
If there are spikes or dropouts, perform the following:
- Inspect each connector terminal and harness for damage or corrosion and
repair as necessary.
- Apply dielectric grease/lubricant (Nyogel 760G or equivalent, meeting GM
specification 9986087) to each connector terminal.
- Ensure each connector and CPA is correctly seated.
- If between 2.1-4.0 ohms without any spikes or dropouts
- All OK
Circuit/System Testing
- Ignition OFF, scan tool disconnected, disconnect the harness connector
at the appropriate F106 Seat Side
Air Bag.
- Test for greater than 25 ohms between the control circuit terminals 1
and 2.
If 25 ohms or less
- Disconnect the X2 harness connector at the K36 Inflatable Restraint
Sensing and Diagnostic
Module.
NOTE: Some connectors
may be equipped with shorting bars as a safety
component to prevent accidental deployment. When testing on a
connector with shorting bars, the shorting bars must be disabled to
ensure accurate test results. Insert an appropriate pick from EL-
38125-580 and depress the shorting bars above the appropriate
terminals. This will lift the shorting bar from the terminal and allow
accurate test results. Take care not to damage the connector,
shorting bar, or terminal when depressing the shorting bar.
- Test for infinite resistance between the 2 control circuits.
- If less than infinite resistance, repair the short between the 2
circuits.
- If infinite resistance, replace the K36 Inflatable Restraint Sensing and
Diagnostic Module.
- If greater than 25 ohms
- Ignition ON.
- Test for less than 11 V between each control circuit terminal listed
below and ground:
- Control circuit terminal 1
- Control circuit terminal 2
- If 11 V or greater
- Ignition OFF, disconnect the X2 harness connector at the K36 Inflatable
Restraint Sensing and
Diagnostic Module, ignition ON.
- Test for less than 1 V between the control circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K36 Inflatable Restraint Sensing and
Diagnostic Module.
- If less than 11 V
- Ignition OFF.
- Test for greater than 25 ohms between each control circuit terminal
listed below and ground:
- Control circuit terminal 1
- Control circuit terminal 2
- If 25 ohms or less
- Disconnect the X2 harness connector at the K36 Inflatable Restraint
Sensing and Diagnostic
Module.
- Test for infinite resistance between the control circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the K36 Inflatable Restraint Sensing and
Diagnostic Module.
- If greater than 25 ohms
- Install a 3 A fused jumper wire between the control circuit terminals 1
and 2, ignition ON.
- Verify DTC B0014 0E, B0021 0E, B0031 0E, or B0038 0E is set.
- If B0014 0E, B0021 0E, B0031 0E, or B0038 0E is not set
- Ignition OFF, disconnect the X2 harness connector at the K36 Inflatable
Restraint Sensing and
Diagnostic Module.
- Test for less than 2 ohms in each control circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K36 Inflatable Restraint Sensing and
Diagnostic Module.
- If B0014 0E, B0021 0E, B0031 0E, or B0038 0E is set
- Ignition OFF, connect the harness connector at the F106 Seat Side Air
Bag, press in the CPA (if
equipped) until an audible and/or tactile click is heard.
- Ignition ON, clear DTCs. Operate the vehicle within the Conditions for
Running the DTC.
- Verify DTC B0014, B0021, B0031, or B0038 is not set.
- If DTC B0014, B0021, B0031, or B0038 is set
Test or replace the F106 Seat Side Air Bag.
- If DTC B0014, B0021, B0031, or B0038 is not set
- All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Front Seat Outboard Seat Back Airbag Replacement
- Rear Seat Bolster Airbag Replacement (AYF)
- Control Module References for inflatable restraint sensing and
diagnostic module replacement,
programming, and setup
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
SEE MORE:
DATA COMMUNICATION WIRING SCHEMATICS (ENCORE)
Power, Ground, and Low Speed GMLAN
Fig. 1: Power, Ground, and Low Speed GMLAN
High Speed GMLAN Bus (1 of 2)
Fig. 2: High Speed GMLAN Bus (1 of 2)
High Speed GMLAN Bus (2 of 2)
Fig. 3: High Speed GMLAN Bus (2 of 2)
High Speed GMLAN Bus 2
Fig. 4: H
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
Diagnostic Fault